Sanitize course_id in ListStudentSubmissionsRequest and ListStudentsRequest.

Bug: b:343731449, b:336883265
Change-Id: I152df6d86d04abce6c9794a09a6d2d008c6ccf17
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5689576
Reviewed-by: Artsiom Mitrokhin <amitrokhin@chromium.org>
Reviewed-by: April Zhou <aprilzhou@google.com>
Commit-Queue: Tali Gorokhovsky <taligoro@google.com>
Cr-Commit-Position: refs/heads/main@{#1325227}
NOKEYCHECK=True
GitOrigin-RevId: 420682420e58bd527cbba19af8d4d319d6d45ffc
2 files changed